Current-mode direct conversion receiver

Details Current-mode direct conversion receiver Current-mode direct conversion receiver

2004-03-08

2008-08-19

Vo, Nguyen (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S324000

Reexamination Certificate

active

07415260

ABSTRACT:
A current-mode direct conversion RF receiver is presented. In one set of embodiments the RF receiver comprises a simple transconductor input stage to create a current-mode modulated signal from a voltage-mode modulated signal. A downconversion mixer may be coupled to the transconductor input stage via a low impedance current cascode stage, and may operate to create a set of current-mode quadrature baseband signals from the current-mode modulated signal. The downconversion mixer may be implemented with a transistor-switching network, which may be driven by a phase locked loop (PLL) with quadrature outputs. The set of current-mode quadrature baseband signals may be converted back to the voltage domain by a transimpedance filter, which may perform channel selection for the receiver. The transimpedance filter may additionally include a low frequency zero to remove DC offsets. The receiver may be implemented using CMOS design technologies and operated with minimal self-mixing effects, minimal DC offset in the baseband signal, and utilizing low voltages.

REFERENCES:
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patent: 2006/0057989 (2006-03-01), Wu
Parssinen, J., et al., “A 2-GHz Wide-Band Direct Conversion Receiver for WCDMA Applications,” IEEE Journal of Solid-State Circuits, Dec. 1999, pp. 1893-1903, vol. 34, No. 12.

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